Drier felt



April 26, 1938. B W|||TT|ER 2,115,658

DRIER FELT Filed July l, 1957 75 5gg A YZ E J 6 15 VL V1 r P1 /H ml, i

Strata/vu rat-med Apr. ze, 193e Bussum "FTENr V"orner Dama FELT Beniamin L. Whittier, Buxton, Md., assigner to Mt. Vernon-WoodberryMills, Inc., Baltimore, Md., a corporation of Maryland Application July` 1, 1937, Serial No. 151,487

Claims.

This invention relates to a fabric for use as a. belting, webbing, or the like, acting as a conveyor or guide where a strong iiexible fabric is required. This invention particularly relates to 5 a belting, webbing, or the like, to be used in paper manufacturing plants, or 'the like, as a guide or conveyor belt, commonly' known as a drier felt, for wet newly formed paper passing through the drier machines coming in contact with a series of heated drying drums.

Drier felts have been manufactured of woven multi-ply construction composed entirely of cotton or similar material. These felts have been found to be relatively short lived and not suliiciently durable when subjected to excessive heat.

In order to provide a drier felt of greater durability multi-ply fabrics with an asbestos sur, face or facing have been manufactured. Such asbestos faced fabrics have been woven to provide a solid asbestos paper supporting and engaging surface. 'I'his type of construction was found to be more durable, butlikewi'se much heavier and more expensive.

In addition, these fabrics had several objectionable features caused by the natural characteristics inherent in asbestos which formed the solid facing, such as roughness, low tensile strength, excessive retention of moisture, chafing and similar well known characteristics.

30 The present invention has for its object the overcoming of the above objectionable features and the provision of a drier felt possessing substantially the same advantageous characteristics of a multi-ply cotton fabric as to strength, weight, cost, surface finish, moisture retention ,and the like but of considerably improved durability.

The invention contemplates the provision of a drier felt of a three-ply or multi-ply construction mainly consisting of cotton but with an asbestos strand interspersed periodically between the cotton strands to withstand excessive heat and to form a binder for the cotton strands ,or fibers.

The invention will be hereinafter more particularly described with reference to the drawn lng` forming a part hereof', and later pointed out in the claims at the end of the description.

In the drawing:

Fig.- l is a. plan view on an enlarged scale of a drier feltv illustrating one application of the invention;

Fig. 2', a longitudinal section on the line 2-2 ofFlg. l; and, 55 Fig. 3, an expanded plan view illustrating more in detail the construction of the top or surface layer of the fabric shown in Fig. 1.

Referring to the drawing in detail, the improved drier felt consists of a multi-ply fabric of woven construction which for the purpose of illustration is shown formed of three plies. This fabric includes upper warp threads or strands I0 and lower warp threads or strands II of cotton or like material with asbestos binder threads or strands I2 interwoven or interspersed between the threads or strands I0. The upper, lower and intermediate weft strands, or picks of the nlling. indicated 'at I3, I4 and I5, respectively, are also preferably comprised of cotton or material having the characteristics of cotton. Practical experience has demonstrated that the relative number of asbestos strands shown in the drawing is highly satisfactory when the webbing or belt material is used as'a drier felt. The warps are preferably each looped or passed about alternate wefts or picks of filling in each of two adjacent plies as illustrated.

It will be s een that this type of fabric construction provides a drier felt having substantially the same advantageous characteristics of a cotton felt, or a felt made up completely of strands of cotton or analogous material, and yet at the same time the felt has much greater durability than a cotton felt and its life will be substantially greater because of the inter-woven heat resisting asbestos yarns.

It will be understood that the construction and arrangement of the weave as well as the relative number of asbestos and cotton strands may be l varied within certain limits.

For example, a certain number of the weft strands could be of asbestos; the lower warp threads I I could also have asbestos strands interspersed therebetween, and other minor changes adopted within the scope of the invention as' defined by the appended claims.

I claim:

l. A three-ply woven drier felt comprising cotton filling, and warp threads each passed about .alternate picks of filling in each of two adjacent plies, and every third warp thread in the surface ply being an asbestos thread with the remaining warp threads being of cotton.

2. A multi-ply woven drier felt comprising ,cotton filling, and warp threads each "passed about alternate picks of filling in each of two adjacent plies, and at least two-thirds of the number of warp threads in the surface ply being of cotton and the remainder being principally of asbestos.

the latter being uniformly distributed across the surface ply.

3. A multi-ply woven drier felt comprising lling having the characteristics of cotton, and warp threads each passed about alternate picks of lllng ineach of two adjacent plies, and at least two-thirds of the number of Warp threads in the surface ply having the characteristics of cotton and the remainder being threads composed principally of asbestos, the latter being uniformly distributed across the surface ply.

4. A multi-ply woven drier felt comprising lling having the characteristics of cotton, and warp threads each passed about alternate picks of lling in each of two adjacent plies, and at least two-thirds of the number of warps in the surface ply having the characteristics of cotton and the remaining warps thereof being composed prlncipally of asbestos, the latter being uniformly distributed across the surface ply, with the interweaving of the adjacent asbestos warps with the filling being staggered.

5. A three-ply woven drier felt comprising cotton filling, and warp threads each looped about alternate picks of lling in each of two adjacent plies, and every third warp in the surface ply being principally of asbestos and the remaining warps being of material having the characteristics of cotton.

BENJAMIN L. WHI'I'IIER. 

